Fibrous acoustical members and method for producing the same





1. AN ACOUSTICAL MEMBER COMPRISING A BOARD HAVING A GENERALLY PLANARMAIN SURFACE AND CONSISTING OF A DENSIFIED MASS OF HETEROGENEOUSLYARRANGED AND SPACED GLASS FIBERS BONDED TO EACH OTHER BY A RESINOUSBINDER ON SAID FIBERS, THE HETEROGENEOUS ARRANGEMENT OF SAID GLASSFIBERS INCLUDING GLASS FIBERS ARRANGED GENERALLY IN PLANES GENERALLYPARALLEL TO SAID MAIN SURFACE AND CONGLOMERATES OF OTHER GLASS FIBERS,AT LEAST SOME OF WHICH EXTEND ANGULARLY TO SAID MAIN SURFACE, SAIDDENSIFIED MASS HAVING CORRESPONDING AREAS OF DIFFERENT DENSITIES, AND ADISCONTINUOUS COATING COMPRISING A MULTIPLICITY OF RANDOMLY DISPOSED,INORGANIC, PARTICULATE FIBERS DEPOSITED FROM A LIQUID DISPERSIONINCLUDING A FILM-FORMING LIQUID ONTO SAID MAIN SURFACE OF SAID BOARD,SAID COATING PARTIALLY EX-